<?php

    /**
     * PHPExcel_Shared_File
     * Copyright (c) 2006 - 2015 PHPExcel
     * This library is free software; you can redistribute it and/or
     * modify it under the terms of the GNU Lesser General Public
     * License as published by the Free Software Foundation; either
     * version 2.1 of the License, or (at your option) any later version.
     * This library is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     * Lesser General Public License for more details.
     * You should have received a copy of the GNU Lesser General Public
     * License along with this library; if not, write to the Free Software
     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
     * @category   PHPExcel
     * @package    PHPExcel_Shared
     * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
     * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
     * @version    ##VERSION##, ##DATE##
     */
    class PHPExcel_Shared_File {
        /*
         * Use Temp or File Upload Temp for temporary files
         *
         * @protected
         * @var    boolean
         */
        protected static $useUploadTempDirectory = false;

        /**
         * Get the flag indicating whether the File Upload Temp directory should be used for temporary files
         * @return     boolean    Use File Upload Temporary directory (true or false)
         */
        public static function getUseUploadTempDirectory() {
            return self::$useUploadTempDirectory;
        }

        /**
         * Set the flag indicating whether the File Upload Temp directory should be used for temporary files
         * @param     boolean $useUploadTempDir Use File Upload Temporary directory (true or false)
         */
        public static function setUseUploadTempDirectory($useUploadTempDir = false) {
            self::$useUploadTempDirectory = (boolean)$useUploadTempDir;
        }

        /**
         * Verify if a file exists
         * @param     string $pFilename Filename
         * @return bool
         */
        public static function file_exists($pFilename) {
            // Sick construction, but it seems that
            // file_exists returns strange values when
            // doing the original file_exists on ZIP archives...
            if (strtolower(substr($pFilename, 0, 3)) == 'zip') {
                // Open ZIP file and verify if the file exists
                $zipFile     = substr($pFilename, 6, strpos($pFilename, '#') - 6);
                $archiveFile = substr($pFilename, strpos($pFilename, '#') + 1);
                $zip = new ZipArchive();
                if ($zip->open($zipFile) === true) {
                    $returnValue = ($zip->getFromName($archiveFile) !== false);
                    $zip->close();
                    return $returnValue;
                } else {
                    return false;
                }
            } else {
                // Regular file_exists
                return file_exists($pFilename);
            }
        }

        /**
         * Returns canonicalized absolute pathname, also for ZIP archives
         * @param string $pFilename
         * @return string
         */
        public static function realpath($pFilename) {
            // Returnvalue
            $returnValue = '';
            // Try using realpath()
            if (file_exists($pFilename)) {
                $returnValue = realpath($pFilename);
            }
            // Found something?
            if ($returnValue == '' || ($returnValue === null)) {
                $pathArray = explode('/', $pFilename);
                while (in_array('..', $pathArray) && $pathArray[0] != '..') {
                    for ($i = 0; $i < count($pathArray); ++$i) {
                        if ($pathArray[$i] == '..' && $i > 0) {
                            unset($pathArray[$i]);
                            unset($pathArray[$i - 1]);
                            break;
                        }
                    }
                }
                $returnValue = implode('/', $pathArray);
            }
            // Return
            return $returnValue;
        }

        /**
         * Get the systems temporary directory.
         * @return string
         */
        public static function sys_get_temp_dir() {
            if (self::$useUploadTempDirectory) {
                //  use upload-directory when defined to allow running on environments having very restricted
                //      open_basedir configs
                if (ini_get('upload_tmp_dir') !== false) {
                    if ($temp = ini_get('upload_tmp_dir')) {
                        if (file_exists($temp)) {
                            return realpath($temp);
                        }
                    }
                }
            }
            // sys_get_temp_dir is only available since PHP 5.2.1
            // http://php.net/manual/en/function.sys-get-temp-dir.php#94119
            if (!function_exists('sys_get_temp_dir')) {
                if ($temp = getenv('TMP')) {
                    if ((!empty($temp)) && (file_exists($temp))) {
                        return realpath($temp);
                    }
                }
                if ($temp = getenv('TEMP')) {
                    if ((!empty($temp)) && (file_exists($temp))) {
                        return realpath($temp);
                    }
                }
                if ($temp = getenv('TMPDIR')) {
                    if ((!empty($temp)) && (file_exists($temp))) {
                        return realpath($temp);
                    }
                }
                // trick for creating a file in system's temporary dir
                // without knowing the path of the system's temporary dir
                $temp = tempnam(__FILE__, '');
                if (file_exists($temp)) {
                    unlink($temp);
                    return realpath(dirname($temp));
                }
                return null;
            }
            // use ordinary built-in PHP function
            //    There should be no problem with the 5.2.4 Suhosin realpath() bug, because this line should only
            //        be called if we're running 5.2.1 or earlier
            return realpath(sys_get_temp_dir());
        }
    }
